It's actually the opposite of what you are saying nikongod. This gets into mid-side processing. If you sum the left and right together you get what most think of as a mono signal, which is all of the in phase information (what our brain reconstructs as the center image). If you take the...

Quote: I've seen this, and it's alright, except I had to redesign it to make it a fully balanced system (if you are clever that means you only need two more poles making it a 6P5T switch). I think you can do an unbalanced switch with 3 poles, but I'd have to think about it for a bit...

  I'm building a switch for headphones to switch between stereo, mono, left-only mono, and right-only mono operation. Obviously the stereo position just passes the signal through.    Since I normally use headphones with an impedance around 30ohms the mono position should have a 20 ohm...

  Quote: So you don't love the free loving, LSD taking, psychedelic colorful ones of the 1960's, but the cold, harsh, military industrial complex, bureaucratic, scientific ones of the 50's? 

Quote:   They are not adding a resistors (having looked at their diagrams), just using a different voice coil. Adding a resistor wouldn't change the inductance (what they mean by "200ohm" and "25ohm"). My guess is some manufacturers add resistors to have sources better match the source...

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  Transformers change the ratio between the impedance of the source and input, so they will each see things differently. Think of it this way: since transformers actually convert voltage into current or visa versa, you can up the current your amp is kicking out (low impedance headphones need...

I'm a big Etymotics fan, but those tend towards being actual "In-Ear-Monitors", thus the aim is presenting the sound in a technically useful way for monitoring applications, rather than for the best musicality. Some find them harsh, others don't. The price to detail ratio is great.   High...

Sounds like the usual shift one can achieve with a better source impedance, in this case better lows and a more appropriate balance. If only people could stick to some kind of standard so there wouldn't be all this malarkey.   Quote:   Do you know what transformers they put into the...

There has been a fair amount of talk about impedance and adaptors lately, so just so people who don't know don't get confused (mind you this isn't all there is, and it's simplified, but it should give you a working model):   Impedance is equivalent to resistance, only for AC rather than DC...

Just emailed Mr. North and will share his response when I get it. Any other responses are welcome of course. 

After a long hiatus due to a horrific schedule, I'm putting the final touches on my design for a pair of custom DT48's. I have one last question, which I posted here: http://www.head-fi.org/forum/thread/510968/impedance-amps-custom-phones-and-dt48-s-let-the-arguments-begin   All those...

I finally have some time to work on the custom 'phones I've been designing for a while now. One of the last thing I have to work out is a built in switchable impedance adaptor. The drivers I'm using are the DT48E 25ohm assemblies.   Some people have reported using an impedance adaptor with...

I would say go try the Grados first and then buy them. If you can also try the AD700s, because those may not give you the Grado sound, but they give you a soundstage that's nice for movies/games, a sound signature some swear by and are far more comfortable. If you can't try them you might...

If possible I'd really really REALLY recommend you try them for yourself. People will give you their opinions, but everyone's ears and tastes are different. If you haven't tried Grado you should give it a shot before you jump in since they do have that lovely Grado signature, but for some that...